PSYCHO GENIUS: The Real Heiress

Kossa is the biological daughter of the Winthrop family. Penelope, who was raised in her place and passed off as the heiress, set her up, and the family committed her to a psychiatric hospital. No one visited for three years. Her condition got worse there, people called her a monster, and she held on through her cat and her studies. She is released and brought home. Penelope keeps needling her, and Kossa stops absorbing it. Her older brother Tristan finds out what actually happened and takes it badly. At the party held to celebrate Penelope's university admission, Kossa lays out what Penelope did and shows that Penelope's record as a top student was faked. Her own ability comes out at the same time. The Winthrops understand by then that they had spent years loving the wrong girl, and Kossa has already decided to leave and build her own life.